login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A157984 n!/(7 * 20!) 0
3, 66, 1518, 36432, 910800, 23680800, 639381600, 17902684800, 519177859200, 15575335776000, 482835409056000, 15450733089792000, 509874191963136000, 17335722526746624000, 606750288436131840000, 21843010383700746240000 (list; graph; refs; listen; history; internal format)
OFFSET

21,1

COMMENTS

From calculations for a Witt design:

http://www.math.uic.edu/~ronan/Witt_design;

a(n)*8!/3! - 48*n!/19!

MATHEMATICA

Flatten[Table[If[IntegerQ[48*3!*n!/(8!*19! )], 48*3!*n!/( 8!*19! ), {}], {n, 0, 48}]] (* From Roger L. Bagula *)

Select[With[{n=48 3!, d=8! 19!}, Table[(n  i!)/d, {i, 50}]], IntegerQ] (* From Harvey P. Dale, Jan 05 2011 *)

f[n_] := n!/(7 * 20!); Array[f, 10, 21] (* From Robert G. Wilson v, Jan 05 2011 *)

CROSSREFS

Sequence in context: A028567 A003359 A157543 * A187547 A157554 A165655

Adjacent sequences:  A157981 A157982 A157983 * A157985 A157986 A157987

KEYWORD

nonn

AUTHOR

Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Mar 10 2009

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 01:31 EST 2012. Contains 205860 sequences.